Don Ryan / The Associated PressA protester offers police a rose after the deadline passed when the city wanted them to vacate the Occupy Portland Camp in Portland, Ore., Sunday, Nov. 13, 2011. Thousands of protesters showed up as mounted police and police in riot gear moved in but were forced to back down by the crowd.

State police hauled away the protesters late Saturday night after warning them with megaphones that they were breaking the law in Lafayette Park, the Albany Times-Union reports.

After the arrests the remaining protesters milled around the edges of the park and sang “This Land is Your Land.”

Earlier on Saturday police arrested protester Bradley Russell on trespassing charges. Russell had been building a shelter in the park using squares of foam, packing tape and protest signs. He called it his “freedom fort.”

The Occupy Albany protesters have set up their main camp in the city-owned Academy Park. Lafayette Park is adjacent to that park.

Meanwhile, in Portland, Ore., anti-Wall Street protesters and their supporters flooded a city park area early Sunday in defiance of an eviction order, and authorities elsewhere stepped up pressure against the demonstrators, arresting nearly two dozen.

Crowds converged on two adjacent downtown Portland parks where protesters are camped after city officials set a midnight Saturday deadline to disperse. Hours later, protesters remained though by dawn Sunday the crowd had thinned and obeyed police orders to clear the street and take down a makeshift barricades.

At one point overnight, the crowd swelled to thousands.

Don Ryan / The Associated PressA fire truck moves through thousands of protesters in the streets as the deadline nears when the city wants them to vacate the Occupy Portland Camp in Portland, Ore., Sunday, Nov. 13, 2011.

Organizers said they hoped enough people will join them to make it difficult if not impossible for police to carry through on any eviction.

"Occupy the street," one organizer said through a bull horn. "Remain peaceful and aware. We have strength in holding the streets."

Demonstrators had used pallets and old furniture, wood debris and even a bicycle to set up makeshift barricades on either end of a street that runs through the encampment, apparently in an attempt to block traffic. The barricades later were taken down by protesters.

On Sunday at an impromptu news conference, he defended his order, saying it is his job to enforce the law and keep the peace. "This is not a game," he said.

He also noted that implementing the eviction order may require more patience.

"Giving the order that the parks will be closed to the public is putting my foot down. Enforcing will take time," he said.

Police numbers shifted throughout the night, but they showed no signs of moving against the protesters.

Around 4 a.m., a line of about 200 police stretched across a street and in front of a federal courthouse. Protesters facing them appeared to be in a festive spirits with some banging on plastic pails, another clanging a cowbell while others danced in the streets as a man juggled nearby.

Officials said that one officer suffered minor injuries when he was hit by some kind of projectile in the leg.

Police had prepared for a possible clash, warning that dozens of anarchists may be planning a confrontation with authorities. Officers seized pieces of cement blocks Friday, saying they were told some demonstrators had plans to use them as weapons against police. They said they believe some demonstrators are building shields and trying to collect gas masks.

"We are not going to engage in confrontation for a misdemeanor," he said, noting that is the legal violation for remaining in the park after midnight.

It appeared earlier that about 200 campers planned to get arrested. But police action seemed less likely after the crowds swelled the parks in the early morning.

For the second time in as many days, Oakland city officials warned protesters Saturday that they do not have the right to camp in the plaza in front of City Hall and face immediate arrest.

The eviction notices come as officials across the country urged an end to similar gatherings in the wake of three deaths in different cities, including two by gunfire.

Demands for Oakland protesters to pack up increased after a man was shot and killed Thursday near the encampment site.

"Your activities are injurious to health, obstruct the free use of property, interfering with the comfortable enjoyment of (Frank Ogawa Plaza), and unlawfully obstruct the free passage or use of a public park or square," the notice read.

Oakland officials first issued the eviction notice Friday after first pleading with protesters to leave the encampment.

Police officials have said a preliminary investigation suggested the shooting resulted from a fight between two groups of men at or near the encampment. Investigators do not know if the men in the fight were associated with Occupy Oakland, but protesters said there was no connection between the shooting and the camp.

The shooting occurred the same day a 35-year-old military veteran apparently committed suicide in a tent at a Burlington, Vt., Occupy encampment. Police said a preliminary investigation showed the veteran fatally shot himself in the head. They said the death raised questions about whether the protest would be allowed to continue.

In Salt Lake City, police arrested 19 people Saturday when protesters refused to leave a park a day after a man was found dead inside his tent at the encampment.

The arrests came after police moved into the park early in the evening where protesters had been ordered to leave by the end of the day. About 150 people had been living in the camp there for weeks.

Authorities in Denver forced protesters to leave a downtown encampment and arrested four people for interfering with officers who removed illegally pitched tents, said police spokesman Sonny Jackson.

Jackson said police had advised protesters since Wednesday that their tents in Civic Center Park and on a nearby sidewalk were illegal.

Violence marked the protest in San Francisco Saturday where police said two demonstrators attacked two police officers in separate incidents during a march.

Police spokesman Carlos Manfredi said a protester slashed an officer's hand with a pen knife while another protester shoved an officer, causing facial cuts. He said neither officer was seriously hurt, and the assailants couldn't be located.

Meanwhile, in Southern California a small group of protesters braved soggy weather on Saturday to gather for the first time under the banner of Occupy Inland Empire. Members of Occupy movements in Fontana, Redlands, Riverside, and other nearby towns marched past banks and in front of San Bernardino City Hall in what they called a "visibility action," The Sun newspaper reported.